TerraPower Develops Sodium-Cooled Nuclear Reactor
The new design utilizes liquid metal to boost power output during periods of low renewable energy generation.
Updated on Oct. 20, 2026 in Nuclear
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TerraPower is developing a nuclear reactor that uses liquid sodium as a coolant instead of high-pressure water. The system is designed to provide stable energy while offering the ability to increase output when needed.
Why it matters
This reactor design aims to provide reliable backup power for the electrical grid as wind and solar generation fluctuate. By replacing water-cooled systems with liquid metal, the technology simplifies cooling and safety infrastructure.
The reactor utilizes liquid sodium, which features a high boiling point of 1,616 degrees Fahrenheit, allowing the system to operate at lower pressures than conventional reactors. It maintains a standard 345 megawatt output.
The players
TerraPower
TerraPower is a nuclear reactor design and development company that focuses on advanced energy technologies.
The details
The plant integrates large molten sodium tanks that store heat, enabling a temporary surge to 500 megawatts during peak demand. This liquid metal approach addresses safety requirements differently than water-based systems, though sodium requires careful management as it can ignite upon contact with water.
The Big Picture
The reactor design marks a departure from conventional light water nuclear reactors by operating at lower pressures using liquid metal coolant.
If successful, this technology could provide a more reliable and flexible energy source for the national grid, reducing reliance on fossil fuel backups. It may eventually lead to more stable electricity pricing by balancing the variability of wind and solar sources.
The takeaway
Advanced reactor designs like this one represent a shift toward integrating nuclear power with renewable energy sources. This approach prioritizes grid stability by leveraging thermal storage to bridge gaps in energy supply.
Further reading
Learn more about the latest innovations in Nuclear energy development.
Source note: This article includes information reported by The Cool Down.
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